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    <title>Document</title>
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    <header>
        <div class="left">
            <h2>前端初级课程</h2>
            <p>最近修改</p>
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        <div class="right">
            <button>分享</button>
            <button>编辑</button>
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    </header>
    <main>
        <aside>
            <ul>
                <li>111</li>
                <li>222</li>
                <li>333</li>
            </ul>
        </aside>
        <section>
            <h2>111</h2>
            <p>222</p>
            <p>333</p>
            <p>444</p>
        </section>
    </main>
    <footer>
        <div class="box"></div>
        <div class="box"></div>
    </footer>
</body>
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